Valve grinder



July 7, 1925.

S. L. DOERING VALVE GRINDER Filed Sept. 22, 1923 A Inventur Samuel L Dnerm.

Patented `luly 7, 1925.

SAMUEL; Li.. 'iJoERING, 01.1 Lnwoon, iiausas.:

vALvE GR'INDER;

` Application filed-September 22519235' Serial N\o.`-664,157:

and has particular referenceto the typeof grinder used in grinding or re-facing. puppet valve seats of internal combustion-engines.

A prima-ry objectofl this invention is the provision of a: .grinding tool havinga gear member which may be continuously rotated by any suit-able mea-ns, vyet will 'transmit` an oscillating movement to the .sh-aftfcarrys ing'the valve head engagingmeans.`vv

Another object. of thisl invention is tolprovide 'a valve-grinder that-may be operated by hand, by direct worm or helical connection from a motor or by a: flexible shaft connection.

A still further object of this invention is the provision of a simply constructed, compact tool having an adjustable valve head engaging means which may be used in connection with all sizes of valves without the customary removal and replacing of another size.

iVith these general objects in vie-w, as well as minor objects which will appear in the course of the detailed specification, the in-.

vention will now be described with reference to the accompanyingv drawings illustrating three constructions embodying the improvements and designed particularly for operation in the grinding of what are known as puppet valves, after which the novel features of the same will be set forth and defined in the appended claims.

In the drawings:

Figure 1 is a sideelevation of the preferred form of the invention with a portion of the cover plate broken away.

Fig. 2 is a section of the valve-grinding tool taken on line II-II of Fig. 1, looking in the direction of the arrow.

Fig. 3 is a fragmentary sectional view taken on line III- III of Fig. 2 showing one method of transmitting the driving power.

Fig. t is a section of the engaging foot taken on line TV-IV of Fig. 1, looking in the direction of the arrow.

Fig. 5 is another section of the engaging foot taken on line V-V of Fig. 3.

'A Fig. ^6 illustrates one modified form Vof construction, showing the tool adapted to `be operated by `'either hand crank or flexible shfalftl connection. f.

l' Fig. 7 is aV view offa conventionaliform of crank.

Fig. 8 isa fragmentary view of theend of a flexible shaft, and Y Fig. 9 is a sectioncorresponding to that of Fig. 3, :showing the use of helical gears for driving.

yReferring now to the drawings-indetail,

wherein similar reference character-s desig-V nate-like parts throughoutthe several views, 1011s a housing, preferably formed of met-al, having inthe case ofthe preferred form,` a threaded-opening -11 for the reception of a co-actingthreadedportion 12 of an ordinary electric motor '13; g TheVV well knownr 'motor shaft 14- ha's aworm gear 15 rigidlyatta'cihed thereto and disposed in meshing relation with gear teeth 16 vintegral with segmental gear plate 17 within the housing. Stub shaft 18, upon which segmental gear plate 17 rotates, may be formed integral with housing 10. Two segmental sets of teeth 19 and 2O are carriedl by gear plate 17 and are adapted to intermittently engage bevel gears 21 and 22vwhen gear plate 1T is rotated. These gears 21 and 22 are held in operative engagement with the segmental sets of teeth 19 and 20 by a shaft 25 journalled in cover plate 23, which is faste-ned to housing 10 by screws or analogous means 2&1. Gears '21 and 22 are rigidly attached to shaft 25 and transmit oscillating movementthereto as above described and shown in Figure 1. It is plainly evident from the drawing, that in operating the valve-grinder, gear plate 17 is rotated land teeth 19 engage and rotate gear 21 in a counterclockwise direction for approximately one complete turn and, immediately upon completion of this action, teeth 20 enter into engagement with gear 22 and move it, together with shaft 25, in a clockwise direction for one and one-half turns. This ratio of oscillation is highly desirable in puppet valve f grindersof this type, and obviates the customary hand rotation of the entire tool.

The desired pressure may be exerted throughy any suitable handle 26 an'd, in the case of the modified forms, the rotation motion or power may be transmitted to gear plate 17 by an ordinary crank, as illustrated in Figure 7, adapted to engage shaft 27 through the medium of a squared portion 28 and pin opening 29 provided to receive a cotter or tapered pin. A flexible shaft connection 30, shown in Figure 8, may beV used to advantage in the same way, and both methods may be used to rotate helical gears 31 and 32 shown in Figure 9.

Referring at this time to the valve head engaging foot, which is carried and oscillated by shaft 25. This foot comprises a bifurcated body member rigidly attached to shaft 25 by a pin 33 and having depending sides 34. Two slots 35 are provided in theV top. Adjustable members 36 possessing oppositely disposed stubs 37 and 3S carried between sides 34 are locked against movement by screws, bolts or like means 39 which r pass through slots 40 of the adjustable members 3G. Tightening of these screws 40 draw Vsides 34 tightly together and prevents movement of members 36. To increase or decrease the distance between stubs 38, a flat circular plate 41 may be provided, which is held in engagement with the body member by pin 33 elongated for that purpose. Eccentric arcuate slots 42 cut into plate 4l with their outer ends gradually approaching the periphery of the plate, are adapted to receive stubs 37 and force them apart as plate 41 is rotated in the direction of the arrow 30 (Fig. 4). This motion is reversed when it is desired to bring thestubs closer together again. Quick adjustment for different size valve-heads is reached through this construction, and a most desirable result is attained.

Having described the invention, what is claimed is: Y

In a valve-grinder, an adjustablevalve head engaging foot mounted on the shaft 40 thereof, comprising a pair of slotted stub members 'each having an upwardlyV and a downwardly disposed stub, a housing having a pair of alined radial slots in the top thereof and downwardly disposed sidewalls, 45

nature.

SAMUEL L. DOERING. 

